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Undiscounted and Discounted Future Benefit Payments and Gross Premiums (Details) - Life policy reserves: - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	$ 4,840			$ 4,768
Undiscounted expected future gross premiums	4,524			4,364
Discounted expected future benefit payments	2,794	$ 2,634	$ 2,751	2,521	$ 2,662	$ 2,584
Discounted expected future gross premiums	2,736			2,464
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	1,702			1,631
Undiscounted expected future gross premiums	687			653
Discounted expected future benefit payments	668	$ 619	$ 657	586	$ 633	$ 614
Discounted expected future gross premiums	$ 428			$ 379

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